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15.2.11 RS-232 Interface Parameters
The service terminal interface parameters are the following settings and cannot be changed.
15.2.12 Maintenance Bypass
The Liebert STS2 is configured to allow the unit’s electronics to be bypassed to either input source for
maintenance without interruption of power to the load.
The Liebert STS2 is furnished with key-interlocked maintenance bypass breakers to configure the
bypass.
Liebert STS2 units have all electronics isolated from the input, output, and bypass connections to
allow safe servicing of any components without access to hazardous voltages when the unit is in main-
tenance bypass.
See 10.4 - Maintenance Bypass on page 67 for instructions using the Color LCD Graphical Display
unit and 14.2.3 - Maintenance Bypass on page 108 for instructions using the LED units.
15.2.13 Fuseless Design
All Liebert STS2 units are fuseless and are UL rated for use with upstream circuit breakers only.
15.2.14 Options
The following options are available for the Liebert STS2:
See 6.0 - Options for more information.
Table 23 RS-232 settings
Parameter Setting
Interface RS-232 Using EIA Voltage Levels
Baud Rate 9600
Parity None
Number of Data Bits 8
Number of Stop Bits 1
Hardware Flow Control Off
Terminator <CR> <LF>
Handshaking Not supported
Structure Full duplex
Local Echo Off
Optimized Transfer LED Display
Redundant Output Breaker Liebert IS-WEB485ADPT
Distribution Cabinet With I-Line Panelboard Seismic Floor Stand - 18", 24", 30" and 36"
Input Junction Boxes and Cable Export Crating
Comms Board w/Liebert SiteScan and Modem Interface Remote Source Selection
Input Contact Isolator Board Key Lockout Switch
Programmable Relay Board